It is often argued that the head is the most important part of the body to cover

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It is often argued that the head is the most important part of the body to cover when out in cold weather. Estimate the total energy loss by radiation if a person's head is uncovered for 15 min on a very cold, −15°C day, assuming he is bald, his skin temperature is 35°C, and that skin has an emissivity (in the infrared) of 97%.

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